21477004 has 6 divisors (see below), whose sum is σ = 37584764. Its totient is φ = 10738500.

The previous prime is 21476993. The next prime is 21477007. The reversal of 21477004 is 40077412.

It is a super-2 number, since 2×21477004² = 922523401632032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21477004.

It is not an unprimeable number, because it can be changed into a prime (21477007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2684622 + ... + 2684629.

Almost surely, 2^21477004 is an apocalyptic number.

It is an amenable number.

21477004 is a deficient number, since it is larger than the sum of its proper divisors (16107760).

21477004 is a wasteful number, since it uses less digits than its factorization.

21477004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369255 (or 5369253 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 21477004 is about 4634.3288618742. The cubic root of 21477004 is about 277.9657152827.

The spelling of 21477004 in words is "twenty-one million, four hundred seventy-seven thousand, four".